Store › Pentair GRO-50EN 1:1 Membrane Image 1 of 1 Pentair GRO-50EN 1:1 Membrane $99.00 Only 1 available Pentair GRO-50EN Super High Efficiency 1 to 1 ratio, 50 GPD Encapsulated Membrane Element. Requires 150ml Flow Restrictor Add To Cart Added! Pentair GRO-50EN Super High Efficiency 1 to 1 ratio, 50 GPD Encapsulated Membrane Element. Requires 150ml Flow Restrictor Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More You Might Also Like Standard 24 - 75 GPD RO Membrane from $49.00 Standard 5 Stage RO Filter Kit $50.00 Standard 4 Stage RO Filter Kit $40.00 Standard 4 Stage RO Filter Kit (No inline) $45.00 LBS-10 LeakBlock Sensor $59.00 Only 5 available